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# Width Length Ratio

19 Threads found on edaboard.com: Width Length Ratio

## Ohm/sq to Siemens/m conversion

Ohm/sq is "Ohms per square". So a resistor that is say 50 Ohm/sq would be 50 Ohms if its width is the same as its length (W = L). It does not matter what W or L are but only the ratio of the two dimensions. Similarly if L = 2 * W it would be a 100 Ohm resistor or if L = W/2 the it would be a 25 Ohm resistor. So the is no direct relationship (...)

## effect of changing the value of L in 45nm Technology library?

hello everyone, i want to change the width of transistor from W to W/2. i am using 45nm tech library provided by the cadence. and i am using the virtuoso tool. by default the value of W is 120nm. i am unable to set it 60nm because there is limit of 120nm. what should i do?

## inverter width and length

hi, 2:1 ratio is done ,in order to make sure that rise and fall time of the output are same. if we increase the width values , the driving strength of the inverter (current) increases .

## CMOS transistor width length ratio calculation

How to calculate (W/L) of pull up and pull down networks.Please help me with detailed description or provide me with some material. Thanks.

## Analog layout: Length & Width of MOSFET

Can anyone explain me clearly how does change in L & W of MOSFET cause variations in its characteristics. What all changes with L and W respectively and in which way?

## Is it possible to have Aspect ratio of less than 1 in analog circuit design i.e. W<L

I m using 120nm width and 800nm length for some it appropriate to use this much high value of length. Yes, totally ok! Some simulation models would warn you if you'd use a too large (or too small) aspect ratio, because the sim. model then wouldn't be accurate enough, but this usually applies

## Electric vehicle model (tractor)

Specifications: speed: 0,6 m/s weight: no more than 0,5kg with remote control and batteries dimensions: length 25cm, width 10cm, height 11,5cm driver ratio: 60:1 steering rat

## Where to define the V-I characteristics of a new created device\part(cadence)

Where to define the V-I characteristics of a new created device\part. e.g., I have to use MOS and I created my own part using ?NEW PART? in ?USER DEFINED PROPERTIES? i added new property width, length but where I have to give the characteristic equation which defines the relation of voltage, current, W/L ratio and other parameters.

## How to place the transistor of desired WL ratio in cadence manually in Layout Edi.

Hi all, My questions are as //.///I am newbie in cadence. 1)I want to draw the FETs manually In mircowind software by clicking on MOS icon we can fill it there the length and width to draw the MOS in the layout. Can we draw the layout similarly in Cadence Layout editor without the need to exec generate from all sources button.? 2) how

## problem with sweeping the W/L ratio

There is no parameter in the model called "w/L ratio". You have to make W and L variables and number of fingers is not a relevant parameter for what you want to achieve. If you want L fixed and W to vary, make length a variable (call it x for example) then make width a varible called k*x, where k is the desired W/L ratio. (...)

## what is the term for the width of MOS is smaller than Length

We often use this type MOS as large resistor. I wonder if there are some rules in thumb for using this "inverse W/L ratio" transistor.

## How to solve HFSS out of memory error?

Hello, guys: I got some problems in my hfss simulation. My case is a very thin film antenna, around 1um in thickness. I know the large ratio of length/width to thickness is bad for meshing and simulation, but I have to. Every run ends with errors as followed. Now I attach my project here. Could you please try to run it and comment? (...)

## A question on decrease output impendence of EA of LDO

for a buffer without negative feedback, the minimum output resistance is about the reciprocal of the transcondance, so if you need to get a smaller output resistance, all you need to do is to increase the transcondance(Eg:increase the current and the width-length ratio,sometimes using nmos rather pmos due to mobility). it's theoretically (...)

## HFSS Transformer simulation problem

Hi, tompson, Don't worry, " Initial mesh, process mesh3d : Unable to recover all the surface triangles." might be caused by the large ratio between the layers' length/width and thickness. If you have very thin layers, please merge it into other layers. In simulation, the simpler substrate definition, the better. Hope this helps, Rur

## Help me size input transistors for a differential amplifier

There are several equations you need to balance that most books (like Grey + Meyer) will give details on. Being an IC designer, I can tell you how I would get to the first-cut rough sizing. Firstly, the W/L ratio of the diode NMOS should be such that the net current density is approx. 1uA/square. So if your width is 2, and your length is (...)

## Question in FloorPlanning

aspect ratio = width of chip/length of chip =1 means it is square chip core utilization = how many % ur design should accoupy in ur core area = basically choose 70% core utilization then only tools can put clock buffer when u do CTS etc remaining 30 % should used for inserting clock buffers and timing (...)

## Transistor and current ratios

Channel length is very short regarding to width. It's possible to be channel length modulation effect. Or Vt can be related on W/L ratio. For MOS transistors, the theoritical values can vary with other physical parameters.